build: update MacOS version

[tqpcharlie]

Description

Upgrades MacOS runner from deprecated MacOS 13.

Fixes: #338

Type of change

• Refactor (non-breaking change which improves code quality or performance)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

[DennisDyallo]

Thanks a lot for your contribution. Since this step is a bit more involved, it was solved internally in:

#347

Will close this case now.